linux-kernel - [PATCH 3.4 071/176] udf: Verify i

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Date:	Thu,  9 Apr 2015 16:45:19 +0800
From:	lizf@...nel.org
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Jan Kara <jack@...e.cz>,
	Zefan Li <lizefan@...wei.com>
Subject: [PATCH 3.4 071/176] udf: Verify i_size when loading inode

From: Jan Kara <jack@...e.cz>

3.4.107-rc1 review patch.  If anyone has any objections, please let me know.

------------------


commit e159332b9af4b04d882dbcfe1bb0117f0a6d4b58 upstream.

Verify that inode size is sane when loading inode with data stored in
ICB. Otherwise we may get confused later when working with the inode and
inode size is too big.

Reported-by: Carl Henrik Lunde <chlunde@...g.uio.no>
Signed-off-by: Jan Kara <jack@...e.cz>
[lizf: Backported to 3.4: just return on error, as there's no "out" label]
Signed-off-by: Zefan Li <lizefan@...wei.com>
---
 fs/udf/inode.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/fs/udf/inode.c b/fs/udf/inode.c
index aa70035..8053ee7 100644
--- a/fs/udf/inode.c
+++ b/fs/udf/inode.c
@@ -1392,6 +1392,20 @@ static void udf_fill_inode(struct inode *inode, struct buffer_head *bh)
 							iinfo->i_lenEAttr;
 	}
 
+	/* Sanity checks for files in ICB so that we don't get confused later */
+	if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
+		/*
+		 * For file in ICB data is stored in allocation descriptor
+		 * so sizes should match
+		 */
+		if (iinfo->i_lenAlloc != inode->i_size)
+			return;
+		/* File in ICB has to fit in there... */
+		if (inode->i_size > inode->i_sb->s_blocksize -
+					udf_file_entry_alloc_offset(inode))
+			return;
+	}
+
 	switch (fe->icbTag.fileType) {
 	case ICBTAG_FILE_TYPE_DIRECTORY:
 		inode->i_op = &udf_dir_inode_operations;
-- 
1.9.1

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